I had two bad experiences with the SST one year on deer and elk and immediately went to their Interlock to handload for my .243 Sako, a 25-06 Ruger, and 3 30-06s. When I use the 30-06s for elk I go up to their Interbiond that shoots to the same POI as the Interlocks, thus not requiring rezeroing any scopes. I have been very impressed with them and will use them the rest of my hunting days. If I were you, I would get that Hornady Custom Lite ammo in their round nose Interlock that they are now making, rather than the SST, especially for a kid shooting a max of 100 yards like you mentioned.